body{
    display: flex;
    flex-direction: column;

    // 主体
    main{
        position: relative;
        flex-grow: 1;
        background-color: #e8e8e8;

        video{
            position: absolute;
            width: 100%;
            height: 100%;
        }
        
        h1{
            position: absolute;
            bottom: 70px;
            left: 30px;
        }

        p{
            position: absolute;
            bottom: 40px;
            left: 30px;
            font-size: 14px;
        }
    }

    // 底部按钮
    .iconfont-box{
        display: flex;
        justify-content: space-around;
        align-items: center;
        height: 90px;

        i{
            font-size: 30px;
        }
    }

    // 进度条
    .progress{
        position: absolute;
        left: 0;
        bottom: 0;
        z-index: -1;
        width: 0%;
        height: 90px;
        background-color: #4294ff;
    }

    // 蒙层
    .mask{
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        z-index: 60;
        background-color: rgba(29, 149, 205, 0.9);

        p{
            position: absolute;
            left: 30px;
            top: 40px;
            right: 30px;
            color: #fff;
            font-size: 24px;
        }

        // 继续、结束按钮
        .btn{
            display: flex;
            justify-content: space-evenly;
            position: absolute;
            top: 50%;
            width: 100%;
            text-align: center;
            color: #fff;

            div{
                padding-top: 20px;
                width: 100px;
                line-height: 2em;
                height: 100px;
                border-radius: 50%;
                font-size: 14px;
                
                i{
                    display: block;
                    font-size: 30px;
                }
            }

            // 继续训练
            .play{
                background-color: #79f0c2;

            }

            // 结束训练
            .end{
                background-color: #ff6060;
            }
        }

    }
}